init_main.c revision 1.309
1 /* $NetBSD: init_main.c,v 1.309 2007/07/21 19:51:49 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 37 */ 38 39 /* 40 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 71 */ 72 73 #include <sys/cdefs.h> 74 __KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.309 2007/07/21 19:51:49 ad Exp $"); 75 76 #include "opt_ipsec.h" 77 #include "opt_multiprocessor.h" 78 #include "opt_ntp.h" 79 #include "opt_pipe.h" 80 #include "opt_posix.h" 81 #include "opt_syscall_debug.h" 82 #include "opt_sysv.h" 83 #include "opt_systrace.h" 84 #include "opt_fileassoc.h" 85 #include "opt_ktrace.h" 86 #include "opt_pax.h" 87 88 #include "rnd.h" 89 #include "sysmon_envsys.h" 90 #include "sysmon_power.h" 91 #include "veriexec.h" 92 93 #include <sys/param.h> 94 #include <sys/acct.h> 95 #include <sys/filedesc.h> 96 #include <sys/file.h> 97 #include <sys/errno.h> 98 #include <sys/callout.h> 99 #include <sys/cpu.h> 100 #include <sys/kernel.h> 101 #include <sys/kmem.h> 102 #include <sys/mount.h> 103 #include <sys/proc.h> 104 #include <sys/kthread.h> 105 #include <sys/resourcevar.h> 106 #include <sys/signalvar.h> 107 #include <sys/systm.h> 108 #include <sys/vnode.h> 109 #include <sys/fstrans.h> 110 #include <sys/tty.h> 111 #include <sys/conf.h> 112 #include <sys/disklabel.h> 113 #include <sys/buf.h> 114 #include <sys/device.h> 115 #include <sys/exec.h> 116 #include <sys/socketvar.h> 117 #include <sys/protosw.h> 118 #include <sys/reboot.h> 119 #include <sys/user.h> 120 #include <sys/sysctl.h> 121 #include <sys/event.h> 122 #include <sys/mbuf.h> 123 #include <sys/sched.h> 124 #include <sys/sleepq.h> 125 #include <sys/iostat.h> 126 #include <sys/vmem.h> 127 #include <sys/uuid.h> 128 #include <sys/extent.h> 129 #include <sys/disk.h> 130 #ifdef FAST_IPSEC 131 #include <netipsec/ipsec.h> 132 #endif 133 #ifdef SYSVSHM 134 #include <sys/shm.h> 135 #endif 136 #ifdef SYSVSEM 137 #include <sys/sem.h> 138 #endif 139 #ifdef SYSVMSG 140 #include <sys/msg.h> 141 #endif 142 #ifdef SYSTRACE 143 #include <sys/systrace.h> 144 #endif 145 #ifdef P1003_1B_SEMAPHORE 146 #include <sys/ksem.h> 147 #endif 148 #include <sys/domain.h> 149 #include <sys/namei.h> 150 #if NRND > 0 151 #include <sys/rnd.h> 152 #endif 153 #include <sys/pipe.h> 154 #ifdef LKM 155 #include <sys/lkm.h> 156 #endif 157 #if NVERIEXEC > 0 158 #include <sys/verified_exec.h> 159 #endif /* NVERIEXEC > 0 */ 160 #ifdef KTRACE 161 #include <sys/ktrace.h> 162 #endif 163 #include <sys/debug.h> 164 #include <sys/kauth.h> 165 #include <net80211/ieee80211_netbsd.h> 166 167 #include <sys/syscall.h> 168 #include <sys/syscallargs.h> 169 170 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 171 #include <sys/pax.h> 172 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 173 #include <ufs/ufs/quota.h> 174 175 #include <miscfs/genfs/genfs.h> 176 #include <miscfs/syncfs/syncfs.h> 177 178 #include <machine/cpu.h> 179 180 #include <uvm/uvm.h> 181 182 #include <dev/cons.h> 183 #if NSYSMON_ENVSYS > 0 || NSYSMON_POWER > 0 184 #include <dev/sysmon/sysmonvar.h> 185 #endif 186 187 #include <net/if.h> 188 #include <net/raw_cb.h> 189 190 #include <secmodel/secmodel.h> 191 192 extern struct proc proc0; 193 extern struct lwp lwp0; 194 extern struct cwdinfo cwdi0; 195 196 #ifndef curlwp 197 struct lwp *curlwp = &lwp0; 198 #endif 199 struct proc *initproc; 200 201 struct vnode *rootvp, *swapdev_vp; 202 int boothowto; 203 int cold = 1; /* still working on startup */ 204 struct timeval boottime; /* time at system startup - will only follow settime deltas */ 205 time_t rootfstime; /* recorded root fs time, if known */ 206 int ncpu = 0; /* number of CPUs configured, assume 1 */ 207 208 volatile int start_init_exec; /* semaphore for start_init() */ 209 210 static void check_console(struct lwp *l); 211 static void start_init(void *); 212 void main(void); 213 214 #if defined(__SSP__) || defined(__SSP_ALL__) 215 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; 216 void __stack_chk_fail(void); 217 218 void 219 __stack_chk_fail(void) 220 { 221 panic("stack overflow detected; terminated"); 222 } 223 #endif 224 225 void __secmodel_none(void); 226 __weak_alias(secmodel_start,__secmodel_none); 227 void 228 __secmodel_none(void) 229 { 230 return; 231 } 232 233 /* 234 * System startup; initialize the world, create process 0, mount root 235 * filesystem, and fork to create init and pagedaemon. Most of the 236 * hard work is done in the lower-level initialization routines including 237 * startup(), which does memory initialization and autoconfiguration. 238 */ 239 void 240 main(void) 241 { 242 #ifdef __HAVE_TIMECOUNTER 243 struct timeval time; 244 #endif 245 struct lwp *l; 246 struct proc *p; 247 struct pdevinit *pdev; 248 int s, error; 249 extern struct pdevinit pdevinit[]; 250 #ifdef NVNODE_IMPLICIT 251 int usevnodes; 252 #endif 253 254 /* 255 * Initialize the current LWP pointer (curlwp) before 256 * any possible traps/probes to simplify trap processing. 257 */ 258 l = &lwp0; 259 curlwp = l; 260 l->l_cpu = curcpu(); 261 l->l_proc = &proc0; 262 l->l_lid = 1; 263 264 /* 265 * Attempt to find console and initialize 266 * in case of early panic or other messages. 267 */ 268 consinit(); 269 270 KERNEL_LOCK_INIT(); 271 272 uvm_init(); 273 274 #ifdef DEBUG 275 debug_init(); 276 #endif 277 278 kmem_init(); 279 280 /* Initialize the extent manager. */ 281 extent_init(); 282 283 /* Do machine-dependent initialization. */ 284 cpu_startup(); 285 286 /* Initialize callouts, part 1. */ 287 callout_startup(); 288 289 /* 290 * Initialize the kernel authorization subsystem and start the 291 * default security model, if any. We need to do this early 292 * enough so that subsystems relying on any of the aforementioned 293 * can work properly. Since the security model may dictate the 294 * credential inheritance policy, it is needed at least before 295 * any process is created, specifically proc0. 296 */ 297 kauth_init(); 298 secmodel_start(); 299 300 /* Initialize the buffer cache */ 301 bufinit(); 302 303 /* 304 * Initialize mbuf's. Do this now because we might attempt to 305 * allocate mbufs or mbuf clusters during autoconfiguration. 306 */ 307 mbinit(); 308 309 /* Initialize sockets. */ 310 soinit(); 311 312 /* 313 * The following things must be done before autoconfiguration. 314 */ 315 evcnt_init(); /* initialize event counters */ 316 #if NRND > 0 317 rnd_init(); /* initialize RNG */ 318 #endif 319 320 /* Initialize process and pgrp structures. */ 321 procinit(); 322 lwpinit(); 323 324 /* Initialize signal-related data structures. */ 325 signal_init(); 326 327 /* Create process 0 (the swapper). */ 328 proc0_init(); 329 330 /* Initialize the UID hash table. */ 331 uid_init(); 332 333 /* Charge root for one process. */ 334 (void)chgproccnt(0, 1); 335 336 /* Initialize the run queues, turnstiles and sleep queues. */ 337 sched_rqinit(); 338 turnstile_init(); 339 sleeptab_init(&sleeptab); 340 341 /* MI initialization of the boot cpu */ 342 error = mi_cpu_attach(curcpu()); 343 KASSERT(error == 0); 344 345 /* Initialize the sysctl subsystem. */ 346 sysctl_init(); 347 348 /* Initialize I/O statistics. */ 349 iostat_init(); 350 351 /* Initialize the file systems. */ 352 #ifdef NVNODE_IMPLICIT 353 /* 354 * If maximum number of vnodes in namei vnode cache is not explicitly 355 * defined in kernel config, adjust the number such as we use roughly 356 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 357 */ 358 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 359 if (usevnodes > desiredvnodes) 360 desiredvnodes = usevnodes; 361 #endif 362 vfsinit(); 363 364 /* Initialize fstrans. */ 365 fstrans_init(); 366 367 /* Initialize the select()/poll() system calls. */ 368 selsysinit(); 369 370 /* Initialize asynchronous I/O. */ 371 aio_sysinit(); 372 373 #if NSYSMON_ENVSYS > 0 374 sysmon_envsys_init(); 375 #endif 376 #if NSYSMON_POWER > 0 377 sysmon_power_init(); 378 #endif 379 #ifdef __HAVE_TIMECOUNTER 380 inittimecounter(); 381 ntp_init(); 382 #endif /* __HAVE_TIMECOUNTER */ 383 384 /* Initialize the device switch tables. */ 385 devsw_init(); 386 387 /* Initialize the disk wedge subsystem. */ 388 dkwedge_init(); 389 390 /* Configure the system hardware. This will enable interrupts. */ 391 configure(); 392 393 #if defined(__SSP__) || defined(__SSP_ALL__) 394 { 395 #ifdef DIAGNOSTIC 396 printf("Initializing SSP:"); 397 #endif 398 /* 399 * We initialize ssp here carefully: 400 * 1. after we got some entropy 401 * 2. without calling a function 402 */ 403 size_t i; 404 long guard[__arraycount(__stack_chk_guard)]; 405 406 arc4randbytes(guard, sizeof(guard)); 407 for (i = 0; i < __arraycount(guard); i++) 408 __stack_chk_guard[i] = guard[i]; 409 #ifdef DIAGNOSTIC 410 for (i = 0; i < __arraycount(guard); i++) 411 printf("%lx ", guard[i]); 412 printf("\n"); 413 #endif 414 } 415 #endif 416 ubc_init(); /* must be after autoconfig */ 417 418 /* Lock the kernel on behalf of proc0. */ 419 KERNEL_LOCK(1, l); 420 421 #ifdef SYSTRACE 422 systrace_init(); 423 #endif 424 425 #ifdef SYSVSHM 426 /* Initialize System V style shared memory. */ 427 shminit(); 428 #endif 429 430 #ifdef SYSVSEM 431 /* Initialize System V style semaphores. */ 432 seminit(); 433 #endif 434 435 #ifdef SYSVMSG 436 /* Initialize System V style message queues. */ 437 msginit(); 438 #endif 439 440 #ifdef P1003_1B_SEMAPHORE 441 /* Initialize posix semaphores */ 442 ksem_init(); 443 #endif 444 445 #if NVERIEXEC > 0 446 /* 447 * Initialise the Veriexec subsystem. 448 */ 449 veriexec_init(); 450 #endif /* NVERIEXEC > 0 */ 451 452 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 453 pax_init(); 454 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 455 456 /* Attach pseudo-devices. */ 457 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 458 (*pdev->pdev_attach)(pdev->pdev_count); 459 460 #ifdef FAST_IPSEC 461 /* Attach network crypto subsystem */ 462 ipsec_attach(); 463 #endif 464 465 /* 466 * Initialize protocols. Block reception of incoming packets 467 * until everything is ready. 468 */ 469 s = splnet(); 470 ifinit(); 471 domaininit(); 472 if_attachdomain(); 473 splx(s); 474 475 #ifdef GPROF 476 /* Initialize kernel profiling. */ 477 kmstartup(); 478 #endif 479 480 /* Initialize system accouting. */ 481 acct_init(); 482 483 #ifndef PIPE_SOCKETPAIR 484 /* Initialize pipes. */ 485 pipe_init(); 486 #endif 487 488 /* Setup the scheduler */ 489 sched_init(); 490 491 #ifdef KTRACE 492 /* Initialize ktrace. */ 493 ktrinit(); 494 #endif 495 496 /* Initialize the UUID system calls. */ 497 uuid_init(); 498 499 /* 500 * Create process 1 (init(8)). We do this now, as Unix has 501 * historically had init be process 1, and changing this would 502 * probably upset a lot of people. 503 * 504 * Note that process 1 won't immediately exec init(8), but will 505 * wait for us to inform it that the root file system has been 506 * mounted. 507 */ 508 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 509 panic("fork init"); 510 511 /* 512 * Now that device driver threads have been created, wait for 513 * them to finish any deferred autoconfiguration. Note we don't 514 * need to lock this semaphore, since we haven't booted any 515 * secondary processors, yet. 516 */ 517 while (config_pending) 518 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 519 520 /* 521 * Finalize configuration now that all real devices have been 522 * found. This needs to be done before the root device is 523 * selected, since finalization may create the root device. 524 */ 525 config_finalize(); 526 527 /* 528 * Now that autoconfiguration has completed, we can determine 529 * the root and dump devices. 530 */ 531 cpu_rootconf(); 532 cpu_dumpconf(); 533 534 /* Mount the root file system. */ 535 do { 536 domountroothook(); 537 if ((error = vfs_mountroot())) { 538 printf("cannot mount root, error = %d\n", error); 539 boothowto |= RB_ASKNAME; 540 setroot(root_device, 541 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 542 } 543 } while (error != 0); 544 mountroothook_destroy(); 545 546 /* 547 * Initialise the time-of-day clock, passing the time recorded 548 * in the root filesystem (if any) for use by systems that 549 * don't have a non-volatile time-of-day device. 550 */ 551 inittodr(rootfstime); 552 553 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 554 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 555 556 /* 557 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 558 * reference it. 559 */ 560 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 561 if (error) 562 panic("cannot find root vnode, error=%d", error); 563 cwdi0.cwdi_cdir = rootvnode; 564 VREF(cwdi0.cwdi_cdir); 565 VOP_UNLOCK(rootvnode, 0); 566 cwdi0.cwdi_rdir = NULL; 567 568 /* 569 * Now that root is mounted, we can fixup initproc's CWD 570 * info. All other processes are kthreads, which merely 571 * share proc0's CWD info. 572 */ 573 initproc->p_cwdi->cwdi_cdir = rootvnode; 574 VREF(initproc->p_cwdi->cwdi_cdir); 575 initproc->p_cwdi->cwdi_rdir = NULL; 576 577 /* 578 * Now can look at time, having had a chance to verify the time 579 * from the file system. Reset l->l_rtime as it may have been 580 * munched in mi_switch() after the time got set. 581 */ 582 #ifdef __HAVE_TIMECOUNTER 583 getmicrotime(&time); 584 #else 585 mono_time = time; 586 #endif 587 boottime = time; 588 mutex_enter(&proclist_lock); 589 LIST_FOREACH(p, &allproc, p_list) { 590 KASSERT((p->p_flag & PK_MARKER) == 0); 591 mutex_enter(&p->p_smutex); 592 p->p_stats->p_start = time; 593 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 594 lwp_lock(l); 595 l->l_cpu->ci_schedstate.spc_runtime = time; 596 l->l_rtime.tv_sec = l->l_rtime.tv_usec = 0; 597 lwp_unlock(l); 598 } 599 mutex_exit(&p->p_smutex); 600 } 601 mutex_exit(&proclist_lock); 602 603 /* Create the pageout daemon kernel thread. */ 604 uvm_swap_init(); 605 if (kthread_create(PVM, 0, NULL, uvm_pageout, 606 NULL, NULL, "pgdaemon")) 607 panic("fork pagedaemon"); 608 609 /* Create the filesystem syncer kernel thread. */ 610 if (kthread_create(PINOD, 0, NULL, sched_sync, NULL, NULL, "ioflush")) 611 panic("fork syncer"); 612 613 /* Create the aiodone daemon kernel thread. */ 614 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 615 uvm_aiodone_worker, NULL, PVM, IPL_BIO, 0)) 616 panic("fork aiodoned"); 617 618 vmem_rehash_start(); 619 620 #if defined(MULTIPROCESSOR) 621 /* Boot the secondary processors. */ 622 cpu_boot_secondary_processors(); 623 #endif 624 625 /* Initialize exec structures */ 626 exec_init(1); 627 628 /* 629 * Okay, now we can let init(8) exec! It's off to userland! 630 */ 631 start_init_exec = 1; 632 wakeup(&start_init_exec); 633 634 /* The scheduler is an infinite loop. */ 635 uvm_scheduler(); 636 /* NOTREACHED */ 637 } 638 639 void 640 setrootfstime(time_t t) 641 { 642 rootfstime = t; 643 } 644 645 static void 646 check_console(struct lwp *l) 647 { 648 struct nameidata nd; 649 int error; 650 651 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 652 error = namei(&nd); 653 if (error == 0) 654 vrele(nd.ni_vp); 655 else if (error == ENOENT) 656 printf("warning: no /dev/console\n"); 657 else 658 printf("warning: lookup /dev/console: error %d\n", error); 659 } 660 661 /* 662 * List of paths to try when searching for "init". 663 */ 664 static const char *initpaths[] = { 665 "/sbin/init", 666 "/sbin/oinit", 667 "/sbin/init.bak", 668 NULL, 669 }; 670 671 /* 672 * Start the initial user process; try exec'ing each pathname in "initpaths". 673 * The program is invoked with one argument containing the boot flags. 674 */ 675 static void 676 start_init(void *arg) 677 { 678 struct lwp *l = arg; 679 struct proc *p = l->l_proc; 680 vaddr_t addr; 681 struct sys_execve_args /* { 682 syscallarg(const char *) path; 683 syscallarg(char * const *) argp; 684 syscallarg(char * const *) envp; 685 } */ args; 686 int options, i, error; 687 register_t retval[2]; 688 char flags[4], *flagsp; 689 const char *path, *slash; 690 char *ucp, **uap, *arg0, *arg1 = NULL; 691 char ipath[129]; 692 int ipx, len; 693 694 /* 695 * Now in process 1. 696 */ 697 strncpy(p->p_comm, "init", MAXCOMLEN); 698 699 /* 700 * Wait for main() to tell us that it's safe to exec. 701 */ 702 while (start_init_exec == 0) 703 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 704 705 /* 706 * This is not the right way to do this. We really should 707 * hand-craft a descriptor onto /dev/console to hand to init, 708 * but that's a _lot_ more work, and the benefit from this easy 709 * hack makes up for the "good is the enemy of the best" effect. 710 */ 711 check_console(l); 712 713 /* 714 * Need just enough stack to hold the faked-up "execve()" arguments. 715 */ 716 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 717 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 718 NULL, UVM_UNKNOWN_OFFSET, 0, 719 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 720 UVM_ADV_NORMAL, 721 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 722 panic("init: couldn't allocate argument space"); 723 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 724 725 ipx = 0; 726 while (1) { 727 if (boothowto & RB_ASKNAME) { 728 printf("init path"); 729 if (initpaths[ipx]) 730 printf(" (default %s)", initpaths[ipx]); 731 printf(": "); 732 len = cngetsn(ipath, sizeof(ipath)-1); 733 if (len == 0) { 734 if (initpaths[ipx]) 735 path = initpaths[ipx++]; 736 else 737 continue; 738 } else { 739 ipath[len] = '\0'; 740 path = ipath; 741 } 742 } else { 743 if ((path = initpaths[ipx++]) == NULL) 744 break; 745 } 746 747 ucp = (char *)USRSTACK; 748 749 /* 750 * Construct the boot flag argument. 751 */ 752 flagsp = flags; 753 *flagsp++ = '-'; 754 options = 0; 755 756 if (boothowto & RB_SINGLE) { 757 *flagsp++ = 's'; 758 options = 1; 759 } 760 #ifdef notyet 761 if (boothowto & RB_FASTBOOT) { 762 *flagsp++ = 'f'; 763 options = 1; 764 } 765 #endif 766 767 /* 768 * Move out the flags (arg 1), if necessary. 769 */ 770 if (options != 0) { 771 *flagsp++ = '\0'; 772 i = flagsp - flags; 773 #ifdef DEBUG 774 printf("init: copying out flags `%s' %d\n", flags, i); 775 #endif 776 arg1 = STACK_ALLOC(ucp, i); 777 ucp = STACK_MAX(arg1, i); 778 (void)copyout((void *)flags, arg1, i); 779 } 780 781 /* 782 * Move out the file name (also arg 0). 783 */ 784 i = strlen(path) + 1; 785 #ifdef DEBUG 786 printf("init: copying out path `%s' %d\n", path, i); 787 #else 788 if (boothowto & RB_ASKNAME || path != initpaths[0]) 789 printf("init: trying %s\n", path); 790 #endif 791 arg0 = STACK_ALLOC(ucp, i); 792 ucp = STACK_MAX(arg0, i); 793 (void)copyout(path, arg0, i); 794 795 /* 796 * Move out the arg pointers. 797 */ 798 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 799 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 800 SCARG(&args, path) = arg0; 801 SCARG(&args, argp) = uap; 802 SCARG(&args, envp) = NULL; 803 slash = strrchr(path, '/'); 804 if (slash) 805 (void)suword((void *)uap++, 806 (long)arg0 + (slash + 1 - path)); 807 else 808 (void)suword((void *)uap++, (long)arg0); 809 if (options != 0) 810 (void)suword((void *)uap++, (long)arg1); 811 (void)suword((void *)uap++, 0); /* terminator */ 812 813 /* 814 * Now try to exec the program. If can't for any reason 815 * other than it doesn't exist, complain. 816 */ 817 error = sys_execve(l, &args, retval); 818 if (error == 0 || error == EJUSTRETURN) { 819 KERNEL_UNLOCK_LAST(l); 820 return; 821 } 822 printf("exec %s: error %d\n", path, error); 823 } 824 printf("init: not found\n"); 825 panic("no init"); 826 } 827
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